nrf52832 security level and bonding

[ChenCentrality]

Hi there,

I am adding security to my service characteristic and i found that for security mode 1 level 4, bonding is required in order to access characteristic values. Is it the same case for level1- level3, can i separate characteristic and bonding? eg. add different security level to characteristic and bonding and bond two devices only when i want to? I am using nRF52832 and SDK14.00.

[ChenCentrality]

Thanks for your reply bjorn, i have another question, is the macro BLE_GAP_CONN_SEC_MODE_SET_XXX subject to the ble_gap_sec_params_t settings? For example, according to my experience, if i disable MITM, disable LESC, i can still use the macro BLE_GAP_CONN_SEC_MODE_SET_LESC_ENC_WITH_MITM, which is security level 4. 

[bjorn-spockeli]

Yes, you can still use the BLE_GAP_CONN_SEC_MODE_SET_LESC_ENC_WITH_MITM macro to set the ble_gap_sec_params_t settings of any characteristic even though you set MITM and LESC to 0. However, the peer will never be able to access the attribute if you do so, because it will never be able to pair with MITM or LESC.